One of my cousins graduated from Pune University and here are his insights regarding this.
It is possible to switch to another college under the same university. But it depends on the following factors.
By completing certain official procedures of the respective University and College, you can easily do so. However, you will need to have a good CGPA, i.e above 9. It is possible if you are studying in a non-autonomous or non deemed college. If that branch in that college has seats available then you surely have a chance.